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Reactions of Rhabditis Oxycerca After Long-Term Exposure To Aldicarb and Oxamyl. Iii: Altered Bionomic and Physiological Reactions

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Nearly 400 generations of Rhabditis oxycerca have been bred in oat meal media without nematicides and in media with increasing concentrations of aldicarb and oxamyl, to a present concentration of 600 and 480 ppm, respectively. The aim of the study is to compare some bionomic and physiological parameters of susceptible and nematicide-exposed strains with regard to possible alterations of fitness. The following parameters were tested: temperature tolerance, motion activity, oxygen consumption, migration in electrical fields, reproductivity of individual females and body measurements. In some cases different breeding temperatures (14, 22, 28°C) were included as an additional factor. In media without active substances the susceptible animals are privileged and show more advantageous reactions than nematicide-exposed strains. On the other hand the long-term exposed strains indicate much higher tolerance to the nematicides and better adaptation than the sensitive ones. Aldicarb proved to be the stronger resistance producer. Different temperature conditions can superimpose on the reactions, lower temperatures being generally more favourable than higher ones. Oriented migration in electrical fields is considered to be a useful tool to elucidate behaviour patterns. In both exposed strains body measurements were remarkably reduced,.in particular the tail region. It seems that some alterations (e.g. reduced body size) are part of a changed fitness strategy under permanent nematicide stress. The results are discussed in this context.

Affiliations: 1: Ernst-Moritz-Arndt-University, Zoological Institute, D-17487 Greifswald, Germany


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